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For testing and tagging a battery charger, it’s important to remember that the 240V side of the battery charger must be tested. However, the battery itself doesn't need to be tested as it's an extra low voltage item (ELV) - not exceeding 50 V a.c.
As battery chargers are double insulated appliances, using a stainless steel mesh to cover the item is considered best practice (aluminium foil will also work). All that’s required is to clip the return lead to the mesh.
In this scenario, you would perform a Leakage Current Test, which will basically energise the charger.
If you don’t have an earthing cloak, you can perform an Insulation Resistance Test instead. If you do choose this option, you’ll have to probe any metal screws as a touch point.
Main points to remember: